Here’s a Hollar/Mosler plate currently on eBay, the seller states it came from a large round door made in 1924. The seller is in Philadelphia but did not state where the door is/was.
Sometimes when I see something like this on eBay I cringe a little, wondering whether the door was vandalized to remove the item (bad) or whether the item was rescued from a door about to be scrapped (good).
As an interesting detail, note it was made by Mosler in New York but it was almost assuredly built in Hamilton, with New York simply being the sales office that facilitated the contract.
